.append {
  width: 100%;
  height: 80px;
  background-color: #F4F4F4;
}
#footer-box {
  width: 100%;
  height: 80px;
  border: 1px lightgrey solid;
  display: flex;
  justify-content: space-around;
  /*设置fixed定位,然后把bottom设为0*/
  position: fixed;
  bottom: 0px;
  background-color: white;
}
#footer-box .footer-icon {
  height: 80px;
  font-size: 40px;
  line-height: 80px;
  color: gray;
  text-align: center;
}
#footer-box .footer-icon .icon {
  vertical-align: middle;
}
#footer-box .footer-icon .icon .icon-content {
  display: block;
  font-size: 15px;
}
#active {
  color: lightseagreen;
}
